The source of the codec for FXT1 and DXTn texture compression, build by Daniel Borca, is available for download. This codec can be used with the Mesafx 6.3.0.1 distributed in Amigamerlin 3.1 R6 as ICD.The FXT1 and DXTn codecs were written using documentation freely available on the world-wide-web, including, but not limited to: 3DFX_texture_compression_FXT1 and EXT_texture_compression_s3tc from http://oss.sgi.com/projects/ogl-sample/registry/
No Binary is distributed, then if you want to use it, you have to compile it yourself.